linux-kernel - Re: [PATCH] drm/panfrost: Ignore core_mask for poweroff and sync interrupts

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Date:   Thu, 23 Nov 2023 11:40:53 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        steven.price@....com
Cc:     boris.brezillon@...labora.com, robh@...nel.org,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...il.com, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com
Subject: Re: [PATCH] drm/panfrost: Ignore core_mask for poweroff and sync
 interrupts

Il 23/11/23 11:39, Krzysztof Kozlowski ha scritto:
> On 23/11/2023 10:53, AngeloGioacchino Del Regno wrote:
>> Some SoCs may be equipped with a GPU containing two core groups
>> and this is exactly the case of Samsung's Exynos 5422 featuring
>> an ARM Mali-T628 MP6 GPU: the support for this GPU in Panfrost
>> is partial, as this driver currently supports using only one
>> core group and that's reflected on all parts of it, including
>> the power on (and power off, previously to this patch) function.
>>
>> The issue with this is that even though executing the soft reset
>> operation should power off all cores unconditionally, on at least
>> one platform we're seeing a crash that seems to be happening due
>> to an interrupt firing which may be because we are calling power
>> transition only on the first core group, leaving the second one
>> unchanged, or because ISR execution was pending before entering
>> the panfrost_gpu_power_off() function and executed after powering
>> off the GPU cores, or all of the above.
> 
> Does not apply - I tried next 20231117/21/22/23.
> 

Sorry about that, I'll send a v2 soon.

Thanks,
Angelo

> Best regards,
> Krzysztof
> 
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